“…This process, known as assisted tandem catalysis [ 6 ], presents significant advantages over multistep synthesis for increasing molecular complexity, particularly in terms of time- and cost-savings, atom economy, environmental friendliness, or applicability to diversity-oriented high-throughput synthesis [ 7 – 10 ]. The monometallic ruthenium–benzylidene complex [RuCl 2 (=CHPh)(PCy 3 ) 2 ] ( 3 ) and its second- or even third-generation analogues developed by Grubbs and co-workers are prominent examples of catalyst precursors that were applied to olefin metathesis in tandem with ATRA [ 11 ], ATRC [ 11 – 14 ], ATRP [ 15 – 18 ], cyclopropanation [ 19 ], dihydroxylation [ 20 ], hydrogenation [ 21 – 23 ], hydrovinylation [ 24 ], isomerization [ 25 – 28 ], oxidation [ 29 ], or Wittig reactions [ 30 ], to name just a few [ 31 ].…”